A train station in Tokyo, Japan has put up a demo LED display which is powered by pedestrians stepping on a spring-board type power generator. "A person weighing 60kg (132 lbs) can generate 0.5W by stepping on the panel twice." The small panel you see above generates enough power for the LED screen to light up and display how much power has been generated so far. Although it will be removed by the end of the year, it still shows the potential power we can generate from the human body.

The greatest thing about this demo is it's sheer practicality in the real world. So many have been talking about solar panel highways or body-heat generating mobile devices, but not so much about kinetic energy. The energy-generating springboard has the additional benefit of being comfortable on the feet and back, something cement and pavement clearly lack. If these were installed in every pedestrian zone (heck, even on roads) it would feel like walking on a basketball court which are in themselves springy. If it proves to be more beneficial instead of developing a solar asphalt, it may just take over ground-level solar production.